Experimental device for hydrogen permeation behaviors of local areas of metal

Abstract

The invention provides an experimental device for hydrogen permeation behaviors of local areas of metal. The experimental device comprises a micro-electrolytic tank and a corrosion environment simulating groove, wherein one face of a working test sample is a detection area and the other face of the working test sample is a corrosion area; one end of the micro-electrolytic tank is contacted with a testing area of the working test sample; the corrosion area of the working test sample is contacted with a corrosion medium in the corrosion environment simulating groove; a three-electrode system is composed of a counter electrode, a reference electrode and the working test sample in the micro-electrolytic tank; the counter electrode, the reference electrode and the working test sample are connected with a counter electrode port, a reference electrode port and a working electrode port of an electrochemical work station by leads respectively; the electrochemical work station is connected with a computer by a data line. The invention provides the experimental device for researching the hydrogen permeation behaviors of the local areas of a metal material in a simulated stress corrosion environment and a testing range can reach a micron grade; the experimental device can be applied to the researches on the hydrogen permeation behaviors of specific narrow areas including a stress concentration area, a crack tip area, a welding line area and the like.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to an experimental device for studying the hydrogen permeation behavior of local areas such as stress concentration areas, crack tip areas, and weld areas of metal materials in a simulated corrosion environment. Background technique [0002] After hydrogen enters the material, it often leads to various damages, such as "white spot" damage caused by cooling supersaturated hydrogen in steel, the formation of brittle hydride phases in some metals and their alloys, plasticity caused by the diffusion and enrichment of atomic hydrogen Loss and hysteresis fracture, etc. The damage of hydrogen to high-strength steel is particularly serious because of its general susceptibility to hydrogen-induced cracking (HIC), and as its strength increases, its HIC susceptibility increases. For fields such as aviation, ships, marine structures, chemical industry, oil refining, oil and gas transportation, etc., w...

AI Technical Summary

Problems solved by technology

However, at present, the test range of such test methods at home and abroad is at the centimeter level, which cannot be applied to the study of hydrogen permeation behavior in relatively narrow local areas of metal materials (such as stress concentration areas, crack tip areas, weld areas, etc.), and this Hydrogen damage is very easy to occur in such local areas, and it is the main area where stress corrosion cracking, hydrogen embrittlement and other failures occur. Therefore, it is of great significance to study the hydrogen permeation behavior of metal local areas.

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